Well I got into the 7.3 public test. Now have an IS-4 and an IS-8 . But it's impossible to play because the server is in Russia . I get a constant ~300 ping to the server so it's very difficult to play.

But the IS-4 now has a gun with 400 penetration :O. They reduced the damage output though. It's like the T110's gun from what I can tell.